Question

please help
X, Y, Z and W are integers. The expression X-Y-Z is even and the expression Y-Z-W is odd. If X is even what must be true?
a.W must be odd b. Y-Z must be odd c.Z must be odd

Answer 1

( a) is the answer

Answer 2

x-y-z------even
x-(y+z)----even
since x is even so (y+z) is even
hence either y and z both are odd or even.

Answer 3

so (y-z) will be an even no

but y-z-w is an odd

so w must be an odd

Answer 4

does it make sense?

Answer 5

i would go to A

Answer 6

ya exactly u r right

Answer 7

i have another problem

Answer 8

post it